With a probe in orbit around Ceres and another rapidly approaching Pluto, this summer promises to teach us a lot about Dwarf Planets (or planetoids, which just sounds better to those of us at Brickmuppet Blog).
First off, regarding Ceres, NASA has put together this retouched animation of the innermost Dwarf Planet.
MUCH farther afield. Pluto's system is going to be visited by New Horizons in July when that probe does a fairly precarious flyby. In the process communications will be cut and hopefully resumed so it can beam the info back at 1 KBps. In the meantime thanks to Hubble, some neat things have been discovered about Pluto, which is actually a dual planetoid system with its moon Charon.